Not sure if the OP is the author, or if the author will read this, but I ate the shed, and at first found it delightful, but then got an annoying bit stuck in my teeth. The Guide first says "The results of the spell are supposed to be independent." And I took that at face value, since I figured this is an educational page rather than a page of brain teasers and trick questions. But then when it asks "in my last 100 c…
No criticism intended of the question itself. Every stats course should have it in there somewhere, it's a very important one. But I'v personally tried my hand at how to phrase it exactly right a couple of times and it's really, really hard.
(Since this is an invitation for 50 people to post their attempts, I would also point out it's easy to phrase it in a way that works for you, who wrote the question. You might find if you take it out for testing that it doesn't work as well as you thought, though. But by all means, smash that reply button. I can't stop you. :) )